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Ammonium phosphate . Infobox references Chemical compound Ammonium phosphate is the inorganic compound with the formula NH 4 3 PO 4 It is the ammonium salt of orthophosphoric acid A related double salt NH 4 3 PO 4 NH 4 2 HPO 4 is also recognized but is impractical use Both triammonium salts evolve ammonia In contrast to the unstable nature of the...